Request-Scope Discipline
RAII as the mechanism that makes request scope concrete, and PMR's monotonic_buffer_resource as its in-language realization — how per-request state is bound to a scope and released all at once.
RAII as the foundation for safe stateful work
The mechanism that makes request scope concrete. The RequestContext pattern, the three exception-safety guarantees, the gRPC callback API as the request boundary, the common mistakes (throwing destructors, raw pointers, locks across co_await), and the performance side of construction and destruction in hot paths.
PMR's monotonic_buffer_resource as architectural statelessness
PMR as the in-language realization of "request brings its own memory, all releases together." The request arena RAII pattern, the canonical layered monotonic + unsynchronized_pool recipe, container-type choices, the lifetime trap counterexample, C++23 additions.